linux-kernel - Re: [PATCH] mptfusion: enable no_write_same in scsi_host

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Message-ID: <54206F60.7020703@canonical.com>
Date:	Mon, 22 Sep 2014 13:50:08 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	bruce.lucas@...godb.com,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mptfusion: enable no_write_same in scsi_host_template


On 09/22/2014 01:19 PM, Christoph Hellwig wrote:
> On Mon, Sep 22, 2014 at 01:17:01PM -0500, Chris J Arges wrote:
>>>
>> I've only been able to reproduce this on VMWare. There is a pretty
>> straightforward reproducer in the BugLink if there is any interest in
>> verifying on hardware.
>>
>> How would you recommending blacklisting only VMWare guests in this case?
> 
> Can you check what PCI subdevice and subvendor IDs the device you can
> reproduce it with have?  If the subvendor is Vmware that would be easy,
> if not the Avago people might be able to help with a device specific
> VMware identification.  If that fails we have kernel helpers to
> identify the hypervisor, but I'd rather avoid that as it would also
> trigger for PCI pass through devices.
> 

Christoph,

Thanks for the input, and now I realize how broad the earlier patch was.
I'll see if I can quirk on the vendor ID to enable no_write_same, in the
meantime I'll see if there are any ways to fix the underlying issue
without adding such a quirk.

Thanks,
--chris j arges
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